Port: win32 DLLs don't support hidden symbols

[lttng-tools.git] / src / common / macros.h

diff --git a/src/common/macros.h b/src/common/macros.h
index 0e11d3c7ac2f8179ea98bda74293c91158d6b2c2..90849ed30ae5e543a577f9214bc33152864751f8 100644 (file)
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -74,10 +74,19 @@ void *zmalloc(size_t len)
 #define LTTNG_PACKED __attribute__((__packed__))
 #endif
 
-#ifndef LTTNG_HIDDEN
+/*
+ * LTTNG_HIDDEN: set the hidden attribute for internal functions
+ * On Windows, symbols are local unless explicitly exported,
+ * see https://gcc.gnu.org/wiki/Visibility
+ */
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define LTTNG_HIDDEN
+#else
 #define LTTNG_HIDDEN __attribute__((visibility("hidden")))
 #endif
 
+#define member_sizeof(type, field)     sizeof(((type *) 0)->field)
+
 /*
  * lttng_strncpy returns 0 on success, or nonzero on failure.
  * It checks that the @src string fits into @dst_len before performing